基于Xshell使用密钥方式连接远程主机

[root@node1 ~]$ yum install -y openssh-server   # 安装 openssh 服务端
[root@node1 ~]$ yum install -y openssh-clients     #安装 openssh 客户端，可以不安装 
[root@node1 ~]$ service sshd start     # 临时开启 sshd 服务
[root@node1 ~]$ chkconfig sshd on      # 永久开启 sshd 服务，服务器重启也生效
[root@node1 ~]$service sshd status     # 查看 sshd 服务运行状态
openssh-daemon (pid 1384) 正在运行...      # 显示正在运行

[root@node1 ~]$ (umask 0077; ssh-keygen)     #  生成 ssh 密钥对，并将权限设置为 600
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):   # 回车
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
fd:72:10:50:a6:7d:83:c7:93:d2:26:3d:12:0e:38:2f root@node1
The key's randomart image is:
+--[RSA 2048]----+
|       .o.+      |
|      o  B * .   |
|       o. O %    |
|      E .. O +   |
|       .S o      |
|           o     |
|          . o    |
|           o     |
|                 |
+-----------------+
[root@node1 ~]$ cd .ssh/
[root@node1 .ssh]$ ll   #  查看密钥 / 公钥对信息，权限都为 600
总用量 8
-rw-------. 1 root root 1675 5 月  21 14:26 id_rsa     # 私钥
-rw-------. 1 root root  392 5 月  21 14:26 id_rsa.pub   # 公钥
[root@node1 .ssh]$ 

PasswordAuthentication no        # 不允许密码验证登录
PubkeyAuthentication yes          # 允许公钥验证登录
AuthorizedKeysFile .ssh/id_rsa.pub  # 指定公钥文件路径

#]sz id_rsa
#]sz id_rsa.pub

[root@node1 .ssh]$ service sshd reload
重新载入 sshd：[确定]

ssh root@IP